1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 4 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Hurr durr I'ma ninja sloth 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41ifneq ($(sub_make_done),1) 42 43# Do not use make's built-in rules and variables 44# (this increases performance and avoids hard-to-debug behaviour) 45MAKEFLAGS += -rR 46 47# Avoid funny character set dependencies 48unexport LC_ALL 49LC_COLLATE=C 50LC_NUMERIC=C 51export LC_COLLATE LC_NUMERIC 52 53# Avoid interference with shell env settings 54unexport GREP_OPTIONS 55 56# Beautify output 57# --------------------------------------------------------------------------- 58# 59# Most of build commands in Kbuild start with "cmd_". You can optionally define 60# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 61# that command is printed by default. 62# 63# e.g.) 64# quiet_cmd_depmod = DEPMOD $(MODLIB) 65# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)$(MAKE) $(build)=scripts/basic 71# 72# If KBUILD_VERBOSE contains 1, the whole command is echoed. 73# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 74# 75# To put more focus on warnings, be less verbose as default 76# Use 'make V=1' to see the full commands 77 78ifeq ("$(origin V)", "command line") 79 KBUILD_VERBOSE = $(V) 80endif 81 82quiet = quiet_ 83Q = @ 84 85ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 86 quiet = 87 Q = 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 93 94ifeq ($(filter 3.%,$(MAKE_VERSION)),) 95short-opts := $(firstword -$(MAKEFLAGS)) 96else 97short-opts := $(filter-out --%,$(MAKEFLAGS)) 98endif 99 100ifneq ($(findstring s,$(short-opts)),) 101quiet=silent_ 102override KBUILD_VERBOSE := 103endif 104 105export quiet Q KBUILD_VERBOSE 106 107# Call a source code checker (by default, "sparse") as part of the 108# C compilation. 109# 110# Use 'make C=1' to enable checking of only re-compiled files. 111# Use 'make C=2' to enable checking of *all* source files, regardless 112# of whether they are re-compiled or not. 113# 114# See the file "Documentation/dev-tools/sparse.rst" for more details, 115# including where to get the "sparse" utility. 116 117ifeq ("$(origin C)", "command line") 118 KBUILD_CHECKSRC = $(C) 119endif 120ifndef KBUILD_CHECKSRC 121 KBUILD_CHECKSRC = 0 122endif 123 124export KBUILD_CHECKSRC 125 126# Enable "clippy" (a linter) as part of the Rust compilation. 127# 128# Use 'make CLIPPY=1' to enable it. 129ifeq ("$(origin CLIPPY)", "command line") 130 KBUILD_CLIPPY := $(CLIPPY) 131endif 132 133export KBUILD_CLIPPY 134 135# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 136# directory of external module to build. Setting M= takes precedence. 137ifeq ("$(origin M)", "command line") 138 KBUILD_EXTMOD := $(M) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154# Kbuild will save output files in the current working directory. 155# This does not need to match to the root of the kernel source tree. 156# 157# For example, you can do this: 158# 159# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 160# 161# If you want to save output files in a different location, there are 162# two syntaxes to specify it. 163# 164# 1) O= 165# Use "make O=dir/to/store/output/files/" 166# 167# 2) Set KBUILD_OUTPUT 168# Set the environment variable KBUILD_OUTPUT to point to the output directory. 169# export KBUILD_OUTPUT=dir/to/store/output/files/; make 170# 171# The O= assignment takes precedence over the KBUILD_OUTPUT environment 172# variable. 173 174# Do we want to change the working directory? 175ifeq ("$(origin O)", "command line") 176 KBUILD_OUTPUT := $(O) 177endif 178 179ifneq ($(KBUILD_OUTPUT),) 180# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 181# expand a shell special character '~'. We use a somewhat tedious way here. 182abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 183$(if $(abs_objtree),, \ 184 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 185 186# $(realpath ...) resolves symlinks 187abs_objtree := $(realpath $(abs_objtree)) 188else 189abs_objtree := $(CURDIR) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifeq ($(abs_objtree),$(CURDIR)) 193# Suppress "Entering directory ..." unless we are changing the work directory. 194MAKEFLAGS += --no-print-directory 195else 196need-sub-make := 1 197endif 198 199this-makefile := $(lastword $(MAKEFILE_LIST)) 200abs_srctree := $(realpath $(dir $(this-makefile))) 201 202ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 203$(error source directory cannot contain spaces or colons) 204endif 205 206ifneq ($(filter 3.%,$(MAKE_VERSION)),) 207# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 208# We need to invoke sub-make to avoid implicit rules in the top Makefile. 209need-sub-make := 1 210# Cancel implicit rules for this Makefile. 211$(this-makefile): ; 212endif 213 214export abs_srctree abs_objtree 215export sub_make_done := 1 216 217ifeq ($(need-sub-make),1) 218 219PHONY += $(MAKECMDGOALS) __sub-make 220 221$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 222 @: 223 224# Invoke a second make in the output directory, passing relevant variables 225__sub-make: 226 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 227 228endif # need-sub-make 229endif # sub_make_done 230 231# We process the rest of the Makefile if this is the final invocation of make 232ifeq ($(need-sub-make),) 233 234# Do not print "Entering directory ...", 235# but we want to display it when entering to the output directory 236# so that IDEs/editors are able to understand relative filenames. 237MAKEFLAGS += --no-print-directory 238 239ifeq ($(abs_srctree),$(abs_objtree)) 240 # building in the source tree 241 srctree := . 242 building_out_of_srctree := 243else 244 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 245 # building in a subdirectory of the source tree 246 srctree := .. 247 else 248 srctree := $(abs_srctree) 249 endif 250 building_out_of_srctree := 1 251endif 252 253ifneq ($(KBUILD_ABS_SRCTREE),) 254srctree := $(abs_srctree) 255endif 256 257objtree := . 258VPATH := $(srctree) 259 260export building_out_of_srctree srctree objtree VPATH 261 262# To make sure we do not include .config for any of the *config targets 263# catch them early, and hand them over to scripts/kconfig/Makefile 264# It is allowed to specify more targets when calling make, including 265# mixing *config targets and build targets. 266# For example 'make oldconfig all'. 267# Detect when mixed targets is specified, and make a second invocation 268# of make so .config is not included in this case either (for *config). 269 270version_h := include/generated/uapi/linux/version.h 271 272clean-targets := %clean mrproper cleandocs 273no-dot-config-targets := $(clean-targets) \ 274 cscope gtags TAGS tags help% %docs check% coccicheck \ 275 $(version_h) headers headers_% archheaders archscripts \ 276 %asm-generic kernelversion %src-pkg dt_binding_check \ 277 outputmakefile rustavailable rustfmt rustfmtcheck 278# Installation targets should not require compiler. Unfortunately, vdso_install 279# is an exception where build artifacts may be updated. This must be fixed. 280no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 281 headers_install modules_install kernelrelease image_name 282no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 283 image_name 284single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 285 286config-build := 287mixed-build := 288need-config := 1 289need-compiler := 1 290may-sync-config := 1 291single-build := 292 293ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 295 need-config := 296 endif 297endif 298 299ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 301 need-compiler := 302 endif 303endif 304 305ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 306 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 307 may-sync-config := 308 endif 309endif 310 311ifneq ($(KBUILD_EXTMOD),) 312 may-sync-config := 313endif 314 315ifeq ($(KBUILD_EXTMOD),) 316 ifneq ($(filter %config,$(MAKECMDGOALS)),) 317 config-build := 1 318 ifneq ($(words $(MAKECMDGOALS)),1) 319 mixed-build := 1 320 endif 321 endif 322endif 323 324# We cannot build single targets and the others at the same time 325ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 326 single-build := 1 327 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# For "make -j clean all", "make -j mrproper defconfig all", etc. 333ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 334 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339# install and modules_install need also be processed one by one 340ifneq ($(filter install,$(MAKECMDGOALS)),) 341 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 342 mixed-build := 1 343 endif 344endif 345 346ifdef mixed-build 347# =========================================================================== 348# We're called with mixed targets (*config and build targets). 349# Handle them one by one. 350 351PHONY += $(MAKECMDGOALS) __build_one_by_one 352 353$(MAKECMDGOALS): __build_one_by_one 354 @: 355 356__build_one_by_one: 357 $(Q)set -e; \ 358 for i in $(MAKECMDGOALS); do \ 359 $(MAKE) -f $(srctree)/Makefile $$i; \ 360 done 361 362else # !mixed-build 363 364include $(srctree)/scripts/Kbuild.include 365 366# Read KERNELRELEASE from include/config/kernel.release (if it exists) 367KERNELRELEASE = $(call read-file, include/config/kernel.release) 368KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 369export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 370 371include $(srctree)/scripts/subarch.include 372 373# Cross compiling and selecting different set of gcc/bin-utils 374# --------------------------------------------------------------------------- 375# 376# When performing cross compilation for other architectures ARCH shall be set 377# to the target architecture. (See arch/* for the possibilities). 378# ARCH can be set during invocation of make: 379# make ARCH=ia64 380# Another way is to have ARCH set in the environment. 381# The default ARCH is the host where make is executed. 382 383# CROSS_COMPILE specify the prefix used for all executables used 384# during compilation. Only gcc and related bin-utils executables 385# are prefixed with $(CROSS_COMPILE). 386# CROSS_COMPILE can be set on the command line 387# make CROSS_COMPILE=ia64-linux- 388# Alternatively CROSS_COMPILE can be set in the environment. 389# Default value for CROSS_COMPILE is not to prefix executables 390# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 391ARCH ?= $(SUBARCH) 392 393# Architecture as present in compile.h 394UTS_MACHINE := $(ARCH) 395SRCARCH := $(ARCH) 396 397# Additional ARCH settings for x86 398ifeq ($(ARCH),i386) 399 SRCARCH := x86 400endif 401ifeq ($(ARCH),x86_64) 402 SRCARCH := x86 403endif 404 405# Additional ARCH settings for sparc 406ifeq ($(ARCH),sparc32) 407 SRCARCH := sparc 408endif 409ifeq ($(ARCH),sparc64) 410 SRCARCH := sparc 411endif 412 413# Additional ARCH settings for parisc 414ifeq ($(ARCH),parisc64) 415 SRCARCH := parisc 416endif 417 418export cross_compiling := 419ifneq ($(SRCARCH),$(SUBARCH)) 420cross_compiling := 1 421endif 422 423KCONFIG_CONFIG ?= .config 424export KCONFIG_CONFIG 425 426# SHELL used by kbuild 427CONFIG_SHELL := sh 428 429HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 430HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 431HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 432 433ifneq ($(LLVM),) 434ifneq ($(filter %/,$(LLVM)),) 435LLVM_PREFIX := $(LLVM) 436else ifneq ($(filter -%,$(LLVM)),) 437LLVM_SUFFIX := $(LLVM) 438endif 439 440HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 441HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 442else 443HOSTCC = gcc 444HOSTCXX = g++ 445endif 446HOSTRUSTC = rustc 447HOSTPKG_CONFIG = pkg-config 448 449KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 450 -O2 -fomit-frame-pointer -std=gnu11 451KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 452KBUILD_USERLDFLAGS := $(USERLDFLAGS) 453 454# These flags apply to all Rust code in the tree, including the kernel and 455# host programs. 456export rust_common_flags := --edition=2021 \ 457 -Zbinary_dep_depinfo=y \ 458 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 459 -Dunreachable_pub -Dnon_ascii_idents \ 460 -Wmissing_docs \ 461 -Drustdoc::missing_crate_level_docs \ 462 -Dclippy::correctness -Dclippy::style \ 463 -Dclippy::suspicious -Dclippy::complexity \ 464 -Dclippy::perf \ 465 -Dclippy::let_unit_value -Dclippy::mut_mut \ 466 -Dclippy::needless_bitwise_bool \ 467 -Dclippy::needless_continue \ 468 -Wclippy::dbg_macro 469 470KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 471KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 472KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 473 -Zallow-features= $(HOSTRUSTFLAGS) 474KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 475KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 476 477# Make variables (CC, etc...) 478CPP = $(CC) -E 479ifneq ($(LLVM),) 480CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 481LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 482AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 483NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 484OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 485OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 486READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 487STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 488else 489CC = $(CROSS_COMPILE)gcc 490LD = $(CROSS_COMPILE)ld 491AR = $(CROSS_COMPILE)ar 492NM = $(CROSS_COMPILE)nm 493OBJCOPY = $(CROSS_COMPILE)objcopy 494OBJDUMP = $(CROSS_COMPILE)objdump 495READELF = $(CROSS_COMPILE)readelf 496STRIP = $(CROSS_COMPILE)strip 497endif 498RUSTC = rustc 499RUSTDOC = rustdoc 500RUSTFMT = rustfmt 501CLIPPY_DRIVER = clippy-driver 502BINDGEN = bindgen 503CARGO = cargo 504PAHOLE = pahole 505RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 506LEX = flex 507YACC = bison 508AWK = awk 509INSTALLKERNEL := installkernel 510DEPMOD = depmod 511PERL = perl 512PYTHON3 = python3 513CHECK = sparse 514BASH = bash 515KGZIP = gzip 516KBZIP2 = bzip2 517KLZOP = lzop 518LZMA = lzma 519LZ4 = lz4c 520XZ = xz 521ZSTD = zstd 522 523PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 524 525CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 526 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 527NOSTDINC_FLAGS := 528CFLAGS_MODULE = 529RUSTFLAGS_MODULE = 530AFLAGS_MODULE = 531LDFLAGS_MODULE = 532CFLAGS_KERNEL = 533RUSTFLAGS_KERNEL = 534AFLAGS_KERNEL = 535LDFLAGS_vmlinux = 536 537# Use USERINCLUDE when you must reference the UAPI directories only. 538USERINCLUDE := \ 539 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 540 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 541 -I$(srctree)/include/uapi \ 542 -I$(objtree)/include/generated/uapi \ 543 -include $(srctree)/include/linux/compiler-version.h \ 544 -include $(srctree)/include/linux/kconfig.h 545 546# Use LINUXINCLUDE when you must reference the include/ directory. 547# Needed to be compatible with the O= option 548LINUXINCLUDE := \ 549 -I$(srctree)/arch/$(SRCARCH)/include \ 550 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 551 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 552 -I$(objtree)/include \ 553 $(USERINCLUDE) 554 555KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 556KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 557 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 558 -Werror=implicit-function-declaration -Werror=implicit-int \ 559 -Werror=return-type -Wno-format-security -funsigned-char \ 560 -std=gnu11 561KBUILD_CPPFLAGS := -D__KERNEL__ 562KBUILD_RUSTFLAGS := $(rust_common_flags) \ 563 --target=$(objtree)/scripts/target.json \ 564 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 565 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 566 -Csymbol-mangling-version=v0 \ 567 -Crelocation-model=static \ 568 -Zfunction-sections=n \ 569 -Dclippy::float_arithmetic 570 571KBUILD_AFLAGS_KERNEL := 572KBUILD_CFLAGS_KERNEL := 573KBUILD_RUSTFLAGS_KERNEL := 574KBUILD_AFLAGS_MODULE := -DMODULE 575KBUILD_CFLAGS_MODULE := -DMODULE 576KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 577KBUILD_LDFLAGS_MODULE := 578KBUILD_LDFLAGS := 579CLANG_FLAGS := 580 581ifeq ($(KBUILD_CLIPPY),1) 582 RUSTC_OR_CLIPPY_QUIET := CLIPPY 583 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 584else 585 RUSTC_OR_CLIPPY_QUIET := RUSTC 586 RUSTC_OR_CLIPPY = $(RUSTC) 587endif 588 589ifdef RUST_LIB_SRC 590 export RUST_LIB_SRC 591endif 592 593# Allows the usage of unstable features in stable compilers. 594export RUSTC_BOOTSTRAP := 1 595 596export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 597export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 598export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 599export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 600export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 601export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 602export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 603export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 604 605export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 606export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 607export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 608export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 609export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 610export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 611export PAHOLE_FLAGS 612 613# Files to ignore in find ... statements 614 615export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 616 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 617 -prune -o 618export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 619 --exclude CVS --exclude .pc --exclude .hg --exclude .git 620 621# =========================================================================== 622# Rules shared between *config targets and build targets 623 624# Basic helpers built in scripts/basic/ 625PHONY += scripts_basic 626scripts_basic: 627 $(Q)$(MAKE) $(build)=scripts/basic 628 629PHONY += outputmakefile 630ifdef building_out_of_srctree 631# Before starting out-of-tree build, make sure the source tree is clean. 632# outputmakefile generates a Makefile in the output directory, if using a 633# separate output directory. This allows convenient use of make in the 634# output directory. 635# At the same time when output Makefile generated, generate .gitignore to 636# ignore whole output directory 637 638quiet_cmd_makefile = GEN Makefile 639 cmd_makefile = { \ 640 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 641 echo "include $(srctree)/Makefile"; \ 642 } > Makefile 643 644outputmakefile: 645 @if [ -f $(srctree)/.config -o \ 646 -d $(srctree)/include/config -o \ 647 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 648 echo >&2 "***"; \ 649 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 650 echo >&2 "*** in $(abs_srctree)";\ 651 echo >&2 "***"; \ 652 false; \ 653 fi 654 $(Q)ln -fsn $(srctree) source 655 $(call cmd,makefile) 656 $(Q)test -e .gitignore || \ 657 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 658endif 659 660# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 661# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 662# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 663# and from include/config/auto.conf.cmd to detect the compiler upgrade. 664CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 665 666ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 667include $(srctree)/scripts/Makefile.clang 668endif 669 670# Include this also for config targets because some architectures need 671# cc-cross-prefix to determine CROSS_COMPILE. 672ifdef need-compiler 673include $(srctree)/scripts/Makefile.compiler 674endif 675 676ifdef config-build 677# =========================================================================== 678# *config targets only - make sure prerequisites are updated, and descend 679# in scripts/kconfig to make the *config target 680 681# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 682# KBUILD_DEFCONFIG may point out an alternative default configuration 683# used for 'make defconfig' 684include $(srctree)/arch/$(SRCARCH)/Makefile 685export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 686 687config: outputmakefile scripts_basic FORCE 688 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 689 690%config: outputmakefile scripts_basic FORCE 691 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 692 693else #!config-build 694# =========================================================================== 695# Build targets only - this includes vmlinux, arch specific targets, clean 696# targets and others. In general all targets except *config targets. 697 698# If building an external module we do not care about the all: rule 699# but instead __all depend on modules 700PHONY += all 701ifeq ($(KBUILD_EXTMOD),) 702__all: all 703else 704__all: modules 705endif 706 707targets := 708 709# Decide whether to build built-in, modular, or both. 710# Normally, just do built-in. 711 712KBUILD_MODULES := 713KBUILD_BUILTIN := 1 714 715# If we have only "make modules", don't compile built-in objects. 716ifeq ($(MAKECMDGOALS),modules) 717 KBUILD_BUILTIN := 718endif 719 720# If we have "make <whatever> modules", compile modules 721# in addition to whatever we do anyway. 722# Just "make" or "make all" shall build modules as well 723 724ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 725 KBUILD_MODULES := 1 726endif 727 728ifeq ($(MAKECMDGOALS),) 729 KBUILD_MODULES := 1 730endif 731 732export KBUILD_MODULES KBUILD_BUILTIN 733 734ifdef need-config 735include include/config/auto.conf 736endif 737 738ifeq ($(KBUILD_EXTMOD),) 739# Objects we will link into vmlinux / subdirs we need to visit 740core-y := 741drivers-y := 742libs-y := lib/ 743endif # KBUILD_EXTMOD 744 745# The all: target is the default when no target is given on the 746# command line. 747# This allow a user to issue only 'make' to build a kernel including modules 748# Defaults to vmlinux, but the arch makefile usually adds further targets 749all: vmlinux 750 751CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 752ifdef CONFIG_CC_IS_GCC 753CFLAGS_GCOV += -fno-tree-loop-im 754endif 755export CFLAGS_GCOV 756 757# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 758ifdef CONFIG_FUNCTION_TRACER 759 CC_FLAGS_FTRACE := -pg 760endif 761 762include $(srctree)/arch/$(SRCARCH)/Makefile 763 764ifdef need-config 765ifdef may-sync-config 766# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 767# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 768# because some architectures define CROSS_COMPILE there. 769include include/config/auto.conf.cmd 770 771$(KCONFIG_CONFIG): 772 @echo >&2 '***' 773 @echo >&2 '*** Configuration file "$@" not found!' 774 @echo >&2 '***' 775 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 776 @echo >&2 '*** "make menuconfig" or "make xconfig").' 777 @echo >&2 '***' 778 @/bin/false 779 780# The actual configuration files used during the build are stored in 781# include/generated/ and include/config/. Update them if .config is newer than 782# include/config/auto.conf (which mirrors .config). 783# 784# This exploits the 'multi-target pattern rule' trick. 785# The syncconfig should be executed only once to make all the targets. 786# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 787# 788# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 789# so you cannot notice that Kconfig is waiting for the user input. 790%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 791 $(Q)$(kecho) " SYNC $@" 792 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 793else # !may-sync-config 794# External modules and some install targets need include/generated/autoconf.h 795# and include/config/auto.conf but do not care if they are up-to-date. 796# Use auto.conf to trigger the test 797PHONY += include/config/auto.conf 798 799include/config/auto.conf: 800 @test -e include/generated/autoconf.h -a -e $@ || ( \ 801 echo >&2; \ 802 echo >&2 " ERROR: Kernel configuration is invalid."; \ 803 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 804 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 805 echo >&2 ; \ 806 /bin/false) 807 808endif # may-sync-config 809endif # need-config 810 811KBUILD_CFLAGS += -fno-delete-null-pointer-checks 812KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 813KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 814KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 815KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 816 817ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 818KBUILD_CFLAGS += -O2 819KBUILD_RUSTFLAGS += -Copt-level=2 820else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 821KBUILD_CFLAGS += -Os 822KBUILD_RUSTFLAGS += -Copt-level=s 823endif 824 825# Always set `debug-assertions` and `overflow-checks` because their default 826# depends on `opt-level` and `debug-assertions`, respectively. 827KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 828KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 829 830# Tell gcc to never replace conditional load with a non-conditional one 831ifdef CONFIG_CC_IS_GCC 832# gcc-10 renamed --param=allow-store-data-races=0 to 833# -fno-allow-store-data-races. 834KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 835KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 836endif 837 838ifdef CONFIG_READABLE_ASM 839# Disable optimizations that make assembler listings hard to read. 840# reorder blocks reorders the control in the function 841# ipa clone creates specialized cloned functions 842# partial inlining inlines only parts of functions 843KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 844endif 845 846ifneq ($(CONFIG_FRAME_WARN),0) 847KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 848endif 849 850stackp-flags-y := -fno-stack-protector 851stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 852stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 853 854KBUILD_CFLAGS += $(stackp-flags-y) 855 856KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 857KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 858KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 859 860KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 861KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 862 863ifdef CONFIG_CC_IS_CLANG 864# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 865KBUILD_CFLAGS += -Wno-gnu 866else 867 868# gcc inanely warns about local variables called 'main' 869KBUILD_CFLAGS += -Wno-main 870endif 871 872# These warnings generated too much noise in a regular build. 873# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 874KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 875KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 876 877# These result in bogus false positives 878KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 879 880ifdef CONFIG_FRAME_POINTER 881KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 882KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 883else 884# Some targets (ARM with Thumb2, for example), can't be built with frame 885# pointers. For those, we don't have FUNCTION_TRACER automatically 886# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 887# incompatible with -fomit-frame-pointer with current GCC, so we don't use 888# -fomit-frame-pointer with FUNCTION_TRACER. 889# In the Rust target specification, "frame-pointer" is set explicitly 890# to "may-omit". 891ifndef CONFIG_FUNCTION_TRACER 892KBUILD_CFLAGS += -fomit-frame-pointer 893endif 894endif 895 896# Initialize all stack variables with a 0xAA pattern. 897ifdef CONFIG_INIT_STACK_ALL_PATTERN 898KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 899endif 900 901# Initialize all stack variables with a zero value. 902ifdef CONFIG_INIT_STACK_ALL_ZERO 903KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 904ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 905# https://github.com/llvm/llvm-project/issues/44842 906CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 907export CC_AUTO_VAR_INIT_ZERO_ENABLER 908KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 909endif 910endif 911 912# While VLAs have been removed, GCC produces unreachable stack probes 913# for the randomize_kstack_offset feature. Disable it for all compilers. 914KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 915 916# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 917ifdef CONFIG_ZERO_CALL_USED_REGS 918KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 919endif 920 921ifdef CONFIG_FUNCTION_TRACER 922ifdef CONFIG_FTRACE_MCOUNT_USE_CC 923 CC_FLAGS_FTRACE += -mrecord-mcount 924 ifdef CONFIG_HAVE_NOP_MCOUNT 925 ifeq ($(call cc-option-yn, -mnop-mcount),y) 926 CC_FLAGS_FTRACE += -mnop-mcount 927 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 928 endif 929 endif 930endif 931ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 932 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 933 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 934 endif 935endif 936ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 937 ifdef CONFIG_HAVE_C_RECORDMCOUNT 938 BUILD_C_RECORDMCOUNT := y 939 export BUILD_C_RECORDMCOUNT 940 endif 941endif 942ifdef CONFIG_HAVE_FENTRY 943 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 944 ifeq ($(call cc-option-yn, -mfentry),y) 945 CC_FLAGS_FTRACE += -mfentry 946 CC_FLAGS_USING += -DCC_USING_FENTRY 947 endif 948endif 949export CC_FLAGS_FTRACE 950KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 951KBUILD_AFLAGS += $(CC_FLAGS_USING) 952endif 953 954# We trigger additional mismatches with less inlining 955ifdef CONFIG_DEBUG_SECTION_MISMATCH 956KBUILD_CFLAGS += -fno-inline-functions-called-once 957endif 958 959# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 960ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 961KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 962KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 963LDFLAGS_vmlinux += --gc-sections 964endif 965 966ifdef CONFIG_SHADOW_CALL_STACK 967ifndef CONFIG_DYNAMIC_SCS 968CC_FLAGS_SCS := -fsanitize=shadow-call-stack 969KBUILD_CFLAGS += $(CC_FLAGS_SCS) 970endif 971export CC_FLAGS_SCS 972endif 973 974ifdef CONFIG_LTO_CLANG 975ifdef CONFIG_LTO_CLANG_THIN 976CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 977KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 978else 979CC_FLAGS_LTO := -flto 980endif 981CC_FLAGS_LTO += -fvisibility=hidden 982 983# Limit inlining across translation units to reduce binary size 984KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 985 986# Check for frame size exceeding threshold during prolog/epilog insertion 987# when using lld < 13.0.0. 988ifneq ($(CONFIG_FRAME_WARN),0) 989ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 990KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 991endif 992endif 993endif 994 995ifdef CONFIG_LTO 996KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 997KBUILD_AFLAGS += -fno-lto 998export CC_FLAGS_LTO 999endif 1000 1001ifdef CONFIG_CFI_CLANG 1002CC_FLAGS_CFI := -fsanitize=kcfi 1003KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1004export CC_FLAGS_CFI 1005endif 1006 1007ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1008KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1009endif 1010 1011# arch Makefile may override CC so keep this after arch Makefile is included 1012NOSTDINC_FLAGS += -nostdinc 1013 1014# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1015KBUILD_CFLAGS += -Wvla 1016 1017# disable pointer signed / unsigned warnings in gcc 4.0 1018KBUILD_CFLAGS += -Wno-pointer-sign 1019 1020# In order to make sure new function cast mismatches are not introduced 1021# in the kernel (to avoid tripping CFI checking), the kernel should be 1022# globally built with -Wcast-function-type. 1023KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1024 1025# disable stringop warnings in gcc 8+ 1026KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1027 1028# We'll want to enable this eventually, but it's not going away for 5.7 at least 1029KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1030 1031# Another good warning that we'll want to enable eventually 1032KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1033 1034# Enabled with W=2, disabled by default as noisy 1035ifdef CONFIG_CC_IS_GCC 1036KBUILD_CFLAGS += -Wno-maybe-uninitialized 1037endif 1038 1039# The allocators already balk at large sizes, so silence the compiler 1040# warnings for bounds checks involving those possible values. While 1041# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1042# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1043# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1044# doesn't work (as it is documented to), silently resolving to "0" prior to 1045# version 9.1 (and producing an error more recently). Numeric values larger 1046# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1047# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1048# choice, we must perform a versioned check to disable this warning. 1049# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1050KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1051KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1052 1053# disable invalid "can't wrap" optimizations for signed / pointers 1054KBUILD_CFLAGS += -fno-strict-overflow 1055 1056# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1057KBUILD_CFLAGS += -fno-stack-check 1058 1059# conserve stack if available 1060ifdef CONFIG_CC_IS_GCC 1061KBUILD_CFLAGS += -fconserve-stack 1062endif 1063 1064# Prohibit date/time macros, which would make the build non-deterministic 1065KBUILD_CFLAGS += -Werror=date-time 1066 1067# enforce correct pointer usage 1068KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1069 1070# Require designated initializers for all marked structures 1071KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1072 1073# change __FILE__ to the relative path from the srctree 1074KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1075 1076# include additional Makefiles when needed 1077include-y := scripts/Makefile.extrawarn 1078include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1079include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1080include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1081include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1082include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1083include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1084include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1085include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1086 1087include $(addprefix $(srctree)/, $(include-y)) 1088 1089# scripts/Makefile.gcc-plugins is intentionally included last. 1090# Do not add $(call cc-option,...) below this line. When you build the kernel 1091# from the clean source tree, the GCC plugins do not exist at this point. 1092 1093# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1094KBUILD_CPPFLAGS += $(KCPPFLAGS) 1095KBUILD_AFLAGS += $(KAFLAGS) 1096KBUILD_CFLAGS += $(KCFLAGS) 1097KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1098 1099KBUILD_LDFLAGS_MODULE += --build-id=sha1 1100LDFLAGS_vmlinux += --build-id=sha1 1101 1102KBUILD_LDFLAGS += -z noexecstack 1103ifeq ($(CONFIG_LD_IS_BFD),y) 1104KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1105endif 1106 1107ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1108LDFLAGS_vmlinux += -X 1109endif 1110 1111ifeq ($(CONFIG_RELR),y) 1112# ld.lld before 15 did not support -z pack-relative-relocs. 1113LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1114endif 1115 1116# We never want expected sections to be placed heuristically by the 1117# linker. All sections should be explicitly named in the linker script. 1118ifdef CONFIG_LD_ORPHAN_WARN 1119LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1120endif 1121 1122# Align the bit size of userspace programs with the kernel 1123KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1124KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1125 1126# make the checker run with the right architecture 1127CHECKFLAGS += --arch=$(ARCH) 1128 1129# insure the checker run with the right endianness 1130CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1131 1132# the checker needs the correct machine size 1133CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1134 1135# Default kernel image to build when no specific target is given. 1136# KBUILD_IMAGE may be overruled on the command line or 1137# set in the environment 1138# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1139# this default value 1140export KBUILD_IMAGE ?= vmlinux 1141 1142# 1143# INSTALL_PATH specifies where to place the updated kernel and system map 1144# images. Default is /boot, but you can set it to other values 1145export INSTALL_PATH ?= /boot 1146 1147# 1148# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1149# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1150# an argument if needed. Otherwise it defaults to the kernel install path 1151# 1152export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1153 1154# 1155# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1156# relocations required by build roots. This is not defined in the 1157# makefile but the argument can be passed to make if needed. 1158# 1159 1160MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1161export MODLIB 1162 1163PHONY += prepare0 1164 1165export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1166export MODORDER := $(extmod_prefix)modules.order 1167export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1168 1169ifeq ($(KBUILD_EXTMOD),) 1170 1171build-dir := . 1172clean-dirs := $(sort . Documentation \ 1173 $(patsubst %/,%,$(filter %/, $(core-) \ 1174 $(drivers-) $(libs-)))) 1175 1176export ARCH_CORE := $(core-y) 1177export ARCH_LIB := $(filter %/, $(libs-y)) 1178export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1179# Externally visible symbols (used by link-vmlinux.sh) 1180 1181KBUILD_VMLINUX_OBJS := ./built-in.a 1182ifdef CONFIG_MODULES 1183KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1184KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1185else 1186KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1187endif 1188 1189export KBUILD_VMLINUX_LIBS 1190export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1191 1192# Recurse until adjust_autoksyms.sh is satisfied 1193PHONY += autoksyms_recursive 1194ifdef CONFIG_TRIM_UNUSED_KSYMS 1195# For the kernel to actually contain only the needed exported symbols, 1196# we have to build modules as well to determine what those symbols are. 1197# (this can be evaluated only once include/config/auto.conf has been included) 1198KBUILD_MODULES := 1 1199 1200autoksyms_recursive: $(build-dir) modules.order 1201 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1202 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1203endif 1204 1205autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1206 1207quiet_cmd_autoksyms_h = GEN $@ 1208 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1209 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1210 1211$(autoksyms_h): 1212 $(call cmd,autoksyms_h) 1213 1214# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1215quiet_cmd_ar_vmlinux.a = AR $@ 1216 cmd_ar_vmlinux.a = \ 1217 rm -f $@; \ 1218 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1219 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1220 1221targets += vmlinux.a 1222vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1223 $(call if_changed,ar_vmlinux.a) 1224 1225PHONY += vmlinux_o 1226vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1227 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1228 1229vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1230 @: 1231 1232PHONY += vmlinux 1233# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1234# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1235# unrelated; the decompressors just happen to have the same base name, 1236# arch/*/boot/compressed/vmlinux. 1237# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1238# 1239# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1240# https://savannah.gnu.org/bugs/?61463 1241# For Make > 4.4, the following simple code will work: 1242# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1243vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1244vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1245vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1246 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1247 1248# The actual objects are generated when descending, 1249# make sure no implicit rule kicks in 1250$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1251 1252ifeq ($(origin KERNELRELEASE),file) 1253filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1254else 1255filechk_kernel.release = echo $(KERNELRELEASE) 1256endif 1257 1258# Store (new) KERNELRELEASE string in include/config/kernel.release 1259include/config/kernel.release: FORCE 1260 $(call filechk,kernel.release) 1261 1262# Additional helpers built in scripts/ 1263# Carefully list dependencies so we do not try to build scripts twice 1264# in parallel 1265PHONY += scripts 1266scripts: scripts_basic scripts_dtc 1267 $(Q)$(MAKE) $(build)=$(@) 1268 1269# Things we need to do before we recursively start building the kernel 1270# or the modules are listed in "prepare". 1271# A multi level approach is used. prepareN is processed before prepareN-1. 1272# archprepare is used in arch Makefiles and when processed asm symlink, 1273# version.h and scripts_basic is processed / created. 1274 1275PHONY += prepare archprepare 1276 1277archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1278 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1279 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1280 1281prepare0: archprepare 1282 $(Q)$(MAKE) $(build)=scripts/mod 1283 $(Q)$(MAKE) $(build)=. prepare 1284 1285# All the preparing.. 1286prepare: prepare0 1287ifdef CONFIG_RUST 1288 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1289 $(Q)$(MAKE) $(build)=rust 1290endif 1291 1292PHONY += remove-stale-files 1293remove-stale-files: 1294 $(Q)$(srctree)/scripts/remove-stale-files 1295 1296# Support for using generic headers in asm-generic 1297asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1298 1299PHONY += asm-generic uapi-asm-generic 1300asm-generic: uapi-asm-generic 1301 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1302 generic=include/asm-generic 1303uapi-asm-generic: 1304 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1305 generic=include/uapi/asm-generic 1306 1307# Generate some files 1308# --------------------------------------------------------------------------- 1309 1310# KERNELRELEASE can change from a few different places, meaning version.h 1311# needs to be updated, so this check is forced on all builds 1312 1313uts_len := 64 1314define filechk_utsrelease.h 1315 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1316 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1317 exit 1; \ 1318 fi; \ 1319 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1320endef 1321 1322define filechk_version.h 1323 if [ $(SUBLEVEL) -gt 255 ]; then \ 1324 echo \#define LINUX_VERSION_CODE $(shell \ 1325 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1326 else \ 1327 echo \#define LINUX_VERSION_CODE $(shell \ 1328 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1329 fi; \ 1330 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1331 ((c) > 255 ? 255 : (c)))'; \ 1332 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1333 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1334 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1335endef 1336 1337$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1338$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1339$(version_h): FORCE 1340 $(call filechk,version.h) 1341 1342include/generated/utsrelease.h: include/config/kernel.release FORCE 1343 $(call filechk,utsrelease.h) 1344 1345filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1346 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1347 1348include/generated/compile.h: FORCE 1349 $(call filechk,compile.h) 1350 1351PHONY += headerdep 1352headerdep: 1353 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1354 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1355 1356# --------------------------------------------------------------------------- 1357# Kernel headers 1358 1359#Default location for installed headers 1360export INSTALL_HDR_PATH = $(objtree)/usr 1361 1362quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1363 cmd_headers_install = \ 1364 mkdir -p $(INSTALL_HDR_PATH); \ 1365 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1366 usr/include $(INSTALL_HDR_PATH) 1367 1368PHONY += headers_install 1369headers_install: headers 1370 $(call cmd,headers_install) 1371 1372PHONY += archheaders archscripts 1373 1374hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1375 1376PHONY += headers 1377headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1378 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1379 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1380 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1381 1382ifdef CONFIG_HEADERS_INSTALL 1383prepare: headers 1384endif 1385 1386PHONY += scripts_unifdef 1387scripts_unifdef: scripts_basic 1388 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1389 1390# --------------------------------------------------------------------------- 1391# Install 1392 1393# Many distributions have the custom install script, /sbin/installkernel. 1394# If DKMS is installed, 'make install' will eventually recurse back 1395# to this Makefile to build and install external modules. 1396# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1397 1398quiet_cmd_install = INSTALL $(INSTALL_PATH) 1399 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1400 1401# --------------------------------------------------------------------------- 1402# Tools 1403 1404ifdef CONFIG_OBJTOOL 1405prepare: tools/objtool 1406endif 1407 1408ifdef CONFIG_BPF 1409ifdef CONFIG_DEBUG_INFO_BTF 1410prepare: tools/bpf/resolve_btfids 1411endif 1412endif 1413 1414PHONY += resolve_btfids_clean 1415 1416resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1417 1418# tools/bpf/resolve_btfids directory might not exist 1419# in output directory, skip its clean in that case 1420resolve_btfids_clean: 1421ifneq ($(wildcard $(resolve_btfids_O)),) 1422 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1423endif 1424 1425# Clear a bunch of variables before executing the submake 1426ifeq ($(quiet),silent_) 1427tools_silent=s 1428endif 1429 1430tools/: FORCE 1431 $(Q)mkdir -p $(objtree)/tools 1432 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1433 1434tools/%: FORCE 1435 $(Q)mkdir -p $(objtree)/tools 1436 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1437 1438# --------------------------------------------------------------------------- 1439# Kernel selftest 1440 1441PHONY += kselftest 1442kselftest: headers 1443 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1444 1445kselftest-%: headers FORCE 1446 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1447 1448PHONY += kselftest-merge 1449kselftest-merge: 1450 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1451 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1452 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1453 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1454 1455# --------------------------------------------------------------------------- 1456# Devicetree files 1457 1458ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1459dtstree := arch/$(SRCARCH)/boot/dts 1460endif 1461 1462ifneq ($(dtstree),) 1463 1464%.dtb: dtbs_prepare 1465 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1466 1467%.dtbo: dtbs_prepare 1468 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1469 1470PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1471dtbs: dtbs_prepare 1472 $(Q)$(MAKE) $(build)=$(dtstree) 1473 1474# include/config/kernel.release is actually needed when installing DTBs because 1475# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1476# dtbs_install depend on it as dtbs_install may run as root. 1477dtbs_prepare: include/config/kernel.release scripts_dtc 1478 1479ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1480export CHECK_DTBS=y 1481endif 1482 1483ifneq ($(CHECK_DTBS),) 1484dtbs_prepare: dt_binding_check 1485endif 1486 1487dtbs_check: dtbs 1488 1489dtbs_install: 1490 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1491 1492ifdef CONFIG_OF_EARLY_FLATTREE 1493all: dtbs 1494endif 1495 1496endif 1497 1498PHONY += scripts_dtc 1499scripts_dtc: scripts_basic 1500 $(Q)$(MAKE) $(build)=scripts/dtc 1501 1502ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1503export CHECK_DT_BINDING=y 1504endif 1505 1506PHONY += dt_binding_check 1507dt_binding_check: scripts_dtc 1508 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1509 1510PHONY += dt_compatible_check 1511dt_compatible_check: dt_binding_check 1512 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1513 1514# --------------------------------------------------------------------------- 1515# Modules 1516 1517ifdef CONFIG_MODULES 1518 1519# By default, build modules as well 1520 1521all: modules 1522 1523# When we're building modules with modversions, we need to consider 1524# the built-in objects during the descend as well, in order to 1525# make sure the checksums are up to date before we record them. 1526ifdef CONFIG_MODVERSIONS 1527 KBUILD_BUILTIN := 1 1528endif 1529 1530# Build modules 1531# 1532 1533# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1534# is an exception. 1535ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1536KBUILD_BUILTIN := 1 1537modules: vmlinux 1538endif 1539 1540modules: modules_prepare 1541 1542# Target to prepare building external modules 1543modules_prepare: prepare 1544 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1545 1546export modules_sign_only := 1547 1548ifeq ($(CONFIG_MODULE_SIG),y) 1549PHONY += modules_sign 1550modules_sign: modules_install 1551 @: 1552 1553# modules_sign is a subset of modules_install. 1554# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1555ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1556modules_sign_only := y 1557endif 1558endif 1559 1560modinst_pre := 1561ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1562modinst_pre := __modinst_pre 1563endif 1564 1565modules_install: $(modinst_pre) 1566PHONY += __modinst_pre 1567__modinst_pre: 1568 @rm -rf $(MODLIB)/kernel 1569 @rm -f $(MODLIB)/source 1570 @mkdir -p $(MODLIB)/kernel 1571 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1572 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1573 rm -f $(MODLIB)/build ; \ 1574 ln -s $(CURDIR) $(MODLIB)/build ; \ 1575 fi 1576 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1577 @cp -f modules.builtin $(MODLIB)/ 1578 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1579 1580endif # CONFIG_MODULES 1581 1582### 1583# Cleaning is done on three levels. 1584# make clean Delete most generated files 1585# Leave enough to build external modules 1586# make mrproper Delete the current configuration, and all generated files 1587# make distclean Remove editor backup files, patch leftover files and the like 1588 1589# Directories & files removed with 'make clean' 1590CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1591 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1592 compile_commands.json .thinlto-cache rust/test rust/doc \ 1593 rust-project.json .vmlinux.objs .vmlinux.export.c 1594 1595# Directories & files removed with 'make mrproper' 1596MRPROPER_FILES += include/config include/generated \ 1597 arch/$(SRCARCH)/include/generated .objdiff \ 1598 debian snap tar-install \ 1599 .config .config.old .version \ 1600 Module.symvers \ 1601 certs/signing_key.pem \ 1602 certs/x509.genkey \ 1603 vmlinux-gdb.py \ 1604 *.spec rpmbuild \ 1605 rust/libmacros.so 1606 1607# clean - Delete most, but leave enough to build external modules 1608# 1609clean: rm-files := $(CLEAN_FILES) 1610 1611PHONY += archclean vmlinuxclean 1612 1613vmlinuxclean: 1614 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1615 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1616 1617clean: archclean vmlinuxclean resolve_btfids_clean 1618 1619# mrproper - Delete all generated files, including .config 1620# 1621mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1622mrproper-dirs := $(addprefix _mrproper_,scripts) 1623 1624PHONY += $(mrproper-dirs) mrproper 1625$(mrproper-dirs): 1626 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1627 1628mrproper: clean $(mrproper-dirs) 1629 $(call cmd,rmfiles) 1630 @find . $(RCS_FIND_IGNORE) \ 1631 \( -name '*.rmeta' \) \ 1632 -type f -print | xargs rm -f 1633 1634# distclean 1635# 1636PHONY += distclean 1637 1638distclean: mrproper 1639 @find . $(RCS_FIND_IGNORE) \ 1640 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1641 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1642 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1643 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1644 -type f -print | xargs rm -f 1645 1646 1647# Packaging of the kernel to various formats 1648# --------------------------------------------------------------------------- 1649 1650%src-pkg: FORCE 1651 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1652%pkg: include/config/kernel.release FORCE 1653 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1654 1655# Brief documentation of the typical targets used 1656# --------------------------------------------------------------------------- 1657 1658boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1659boards := $(sort $(notdir $(boards))) 1660board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1661board-dirs := $(sort $(notdir $(board-dirs:/=))) 1662 1663PHONY += help 1664help: 1665 @echo 'Cleaning targets:' 1666 @echo ' clean - Remove most generated files but keep the config and' 1667 @echo ' enough build support to build external modules' 1668 @echo ' mrproper - Remove all generated files + config + various backup files' 1669 @echo ' distclean - mrproper + remove editor backup and patch files' 1670 @echo '' 1671 @echo 'Configuration targets:' 1672 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1673 @echo '' 1674 @echo 'Other generic targets:' 1675 @echo ' all - Build all targets marked with [*]' 1676 @echo '* vmlinux - Build the bare kernel' 1677 @echo '* modules - Build all modules' 1678 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1679 @echo ' dir/ - Build all files in dir and below' 1680 @echo ' dir/file.[ois] - Build specified target only' 1681 @echo ' dir/file.ll - Build the LLVM assembly file' 1682 @echo ' (requires compiler support for LLVM assembly generation)' 1683 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1684 @echo ' (requires a recent binutils and recent build (System.map))' 1685 @echo ' dir/file.ko - Build module including final link' 1686 @echo ' modules_prepare - Set up for building external modules' 1687 @echo ' tags/TAGS - Generate tags file for editors' 1688 @echo ' cscope - Generate cscope index' 1689 @echo ' gtags - Generate GNU GLOBAL index' 1690 @echo ' kernelrelease - Output the release version string (use with make -s)' 1691 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1692 @echo ' image_name - Output the image name (use with make -s)' 1693 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1694 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1695 echo '' 1696 @echo 'Static analysers:' 1697 @echo ' checkstack - Generate a list of stack hogs' 1698 @echo ' versioncheck - Sanity check on version.h usage' 1699 @echo ' includecheck - Check for duplicate included header files' 1700 @echo ' export_report - List the usages of all exported symbols' 1701 @echo ' headerdep - Detect inclusion cycles in headers' 1702 @echo ' coccicheck - Check with Coccinelle' 1703 @echo ' clang-analyzer - Check with clang static analyzer' 1704 @echo ' clang-tidy - Check with clang-tidy' 1705 @echo '' 1706 @echo 'Tools:' 1707 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1708 @echo '' 1709 @echo 'Kernel selftest:' 1710 @echo ' kselftest - Build and run kernel selftest' 1711 @echo ' Build, install, and boot kernel before' 1712 @echo ' running kselftest on it' 1713 @echo ' Run as root for full coverage' 1714 @echo ' kselftest-all - Build kernel selftest' 1715 @echo ' kselftest-install - Build and install kernel selftest' 1716 @echo ' kselftest-clean - Remove all generated kselftest files' 1717 @echo ' kselftest-merge - Merge all the config dependencies of' 1718 @echo ' kselftest to existing .config.' 1719 @echo '' 1720 @echo 'Rust targets:' 1721 @echo ' rustavailable - Checks whether the Rust toolchain is' 1722 @echo ' available and, if not, explains why.' 1723 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1724 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1725 @echo ' is formatted, printing a diff otherwise.' 1726 @echo ' rustdoc - Generate Rust documentation' 1727 @echo ' (requires kernel .config)' 1728 @echo ' rusttest - Runs the Rust tests' 1729 @echo ' (requires kernel .config; downloads external repos)' 1730 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1731 @echo ' (requires kernel .config)' 1732 @echo ' dir/file.[os] - Build specified target only' 1733 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1734 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1735 @echo ' The output is not intended to be compilable.' 1736 @echo ' dir/file.ll - Build the LLVM assembly file' 1737 @echo '' 1738 @$(if $(dtstree), \ 1739 echo 'Devicetree:'; \ 1740 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1741 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1742 echo ' dt_binding_check - Validate device tree binding documents'; \ 1743 echo ' dtbs_check - Validate device tree source files';\ 1744 echo '') 1745 1746 @echo 'Userspace tools targets:' 1747 @echo ' use "make tools/help"' 1748 @echo ' or "cd tools; make help"' 1749 @echo '' 1750 @echo 'Kernel packaging:' 1751 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1752 @echo '' 1753 @echo 'Documentation targets:' 1754 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1755 @echo '' 1756 @echo 'Architecture specific targets ($(SRCARCH)):' 1757 @$(or $(archhelp),\ 1758 echo ' No architecture specific help defined for $(SRCARCH)') 1759 @echo '' 1760 @$(if $(boards), \ 1761 $(foreach b, $(boards), \ 1762 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1763 echo '') 1764 @$(if $(board-dirs), \ 1765 $(foreach b, $(board-dirs), \ 1766 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1767 printf " %-16s - Show all of the above\\n" help-boards; \ 1768 echo '') 1769 1770 @echo ' make V=n [targets] 1: verbose build' 1771 @echo ' 2: give reason for rebuild of target' 1772 @echo ' V=1 and V=2 can be combined with V=12' 1773 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1774 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1775 @echo ' (sparse by default)' 1776 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1777 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1778 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1779 @echo ' 1: warnings which may be relevant and do not occur too often' 1780 @echo ' 2: warnings which occur quite often but may still be relevant' 1781 @echo ' 3: more obscure warnings, can most likely be ignored' 1782 @echo ' e: warnings are being treated as errors' 1783 @echo ' Multiple levels can be combined with W=12 or W=123' 1784 @$(if $(dtstree), \ 1785 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1786 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1787 ) 1788 @echo '' 1789 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1790 @echo 'For further info see the ./README file' 1791 1792 1793help-board-dirs := $(addprefix help-,$(board-dirs)) 1794 1795help-boards: $(help-board-dirs) 1796 1797boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1798 1799$(help-board-dirs): help-%: 1800 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1801 @$(if $(boards-per-dir), \ 1802 $(foreach b, $(boards-per-dir), \ 1803 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1804 echo '') 1805 1806 1807# Documentation targets 1808# --------------------------------------------------------------------------- 1809DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1810 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1811PHONY += $(DOC_TARGETS) 1812$(DOC_TARGETS): 1813 $(Q)$(MAKE) $(build)=Documentation $@ 1814 1815 1816# Rust targets 1817# --------------------------------------------------------------------------- 1818 1819# "Is Rust available?" target 1820PHONY += rustavailable 1821rustavailable: 1822 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1823 1824# Documentation target 1825# 1826# Using the singular to avoid running afoul of `no-dot-config-targets`. 1827PHONY += rustdoc 1828rustdoc: prepare 1829 $(Q)$(MAKE) $(build)=rust $@ 1830 1831# Testing target 1832PHONY += rusttest 1833rusttest: prepare 1834 $(Q)$(MAKE) $(build)=rust $@ 1835 1836# Formatting targets 1837PHONY += rustfmt rustfmtcheck 1838 1839# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1840# 1841# We match using absolute paths since `find` does not resolve them 1842# when matching, which is a problem when e.g. `srctree` is `..`. 1843# We `grep` afterwards in order to remove the directory entry itself. 1844rustfmt: 1845 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1846 -o -path $(abs_srctree)/rust/alloc -prune \ 1847 -o -path $(abs_objtree)/rust/test -prune \ 1848 | grep -Fv $(abs_srctree)/rust/alloc \ 1849 | grep -Fv $(abs_objtree)/rust/test \ 1850 | grep -Fv generated \ 1851 | xargs $(RUSTFMT) $(rustfmt_flags) 1852 1853rustfmtcheck: rustfmt_flags = --check 1854rustfmtcheck: rustfmt 1855 1856# IDE support targets 1857PHONY += rust-analyzer 1858rust-analyzer: 1859 $(Q)$(MAKE) $(build)=rust $@ 1860 1861# Misc 1862# --------------------------------------------------------------------------- 1863 1864PHONY += misc-check 1865misc-check: 1866 $(Q)$(srctree)/scripts/misc-check 1867 1868all: misc-check 1869 1870PHONY += scripts_gdb 1871scripts_gdb: prepare0 1872 $(Q)$(MAKE) $(build)=scripts/gdb 1873 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1874 1875ifdef CONFIG_GDB_SCRIPTS 1876all: scripts_gdb 1877endif 1878 1879else # KBUILD_EXTMOD 1880 1881filechk_kernel.release = echo $(KERNELRELEASE) 1882 1883### 1884# External module support. 1885# When building external modules the kernel used as basis is considered 1886# read-only, and no consistency checks are made and the make 1887# system is not used on the basis kernel. If updates are required 1888# in the basis kernel ordinary make commands (without M=...) must be used. 1889 1890# We are always building only modules. 1891KBUILD_BUILTIN := 1892KBUILD_MODULES := 1 1893 1894build-dir := $(KBUILD_EXTMOD) 1895 1896compile_commands.json: $(extmod_prefix)compile_commands.json 1897PHONY += compile_commands.json 1898 1899clean-dirs := $(KBUILD_EXTMOD) 1900clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1901 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1902 1903PHONY += prepare 1904# now expand this into a simple variable to reduce the cost of shell evaluations 1905prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1906prepare: 1907 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1908 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1909 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1910 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1911 fi 1912 1913PHONY += help 1914help: 1915 @echo ' Building external modules.' 1916 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1917 @echo '' 1918 @echo ' modules - default target, build the module(s)' 1919 @echo ' modules_install - install the module' 1920 @echo ' clean - remove generated files in module directory only' 1921 @echo '' 1922 1923endif # KBUILD_EXTMOD 1924 1925# --------------------------------------------------------------------------- 1926# Modules 1927 1928PHONY += modules modules_install modules_prepare 1929 1930ifdef CONFIG_MODULES 1931 1932$(MODORDER): $(build-dir) 1933 @: 1934 1935# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1936# This is solely useful to speed up test compiles. 1937modules: modpost 1938ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1939 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1940endif 1941 1942PHONY += modules_check 1943modules_check: $(MODORDER) 1944 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1945 1946quiet_cmd_depmod = DEPMOD $(MODLIB) 1947 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1948 $(KERNELRELEASE) 1949 1950modules_install: 1951 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1952 $(call cmd,depmod) 1953 1954else # CONFIG_MODULES 1955 1956# Modules not configured 1957# --------------------------------------------------------------------------- 1958 1959modules modules_install: 1960 @echo >&2 '***' 1961 @echo >&2 '*** The present kernel configuration has modules disabled.' 1962 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1963 @echo >&2 '*** to enable CONFIG_MODULES.' 1964 @echo >&2 '***' 1965 @exit 1 1966 1967KBUILD_MODULES := 1968 1969endif # CONFIG_MODULES 1970 1971PHONY += modpost 1972modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1973 $(if $(KBUILD_MODULES), modules_check) 1974 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1975 1976# Single targets 1977# --------------------------------------------------------------------------- 1978# To build individual files in subdirectories, you can do like this: 1979# 1980# make foo/bar/baz.s 1981# 1982# The supported suffixes for single-target are listed in 'single-targets' 1983# 1984# To build only under specific subdirectories, you can do like this: 1985# 1986# make foo/bar/baz/ 1987 1988ifdef single-build 1989 1990# .ko is special because modpost is needed 1991single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1992single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1993 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1994 1995$(single-ko): single_modules 1996 @: 1997$(single-no-ko): $(build-dir) 1998 @: 1999 2000# Remove MODORDER when done because it is not the real one. 2001PHONY += single_modules 2002single_modules: $(single-no-ko) modules_prepare 2003 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2004 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2005ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2006 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2007endif 2008 $(Q)rm -f $(MODORDER) 2009 2010single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2011 2012KBUILD_MODULES := 1 2013 2014endif 2015 2016# Preset locale variables to speed up the build process. Limit locale 2017# tweaks to this spot to avoid wrong language settings when running 2018# make menuconfig etc. 2019# Error messages still appears in the original language 2020PHONY += $(build-dir) 2021$(build-dir): prepare 2022 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2023 2024clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2025PHONY += $(clean-dirs) clean 2026$(clean-dirs): 2027 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2028 2029clean: $(clean-dirs) 2030 $(call cmd,rmfiles) 2031 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2032 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2033 -o -name '*.ko.*' \ 2034 -o -name '*.dtb' -o -name '*.dtbo' \ 2035 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2036 -o -name '*.dt.yaml' \ 2037 -o -name '*.dwo' -o -name '*.lst' \ 2038 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2039 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2040 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2041 -o -name '*.asn1.[ch]' \ 2042 -o -name '*.symtypes' -o -name 'modules.order' \ 2043 -o -name '*.c.[012]*.*' \ 2044 -o -name '*.ll' \ 2045 -o -name '*.gcno' \ 2046 -o -name '*.*.symversions' \) -type f -print \ 2047 -o -name '.tmp_*' -print \ 2048 | xargs rm -rf 2049 2050# Generate tags for editors 2051# --------------------------------------------------------------------------- 2052quiet_cmd_tags = GEN $@ 2053 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2054 2055tags TAGS cscope gtags: FORCE 2056 $(call cmd,tags) 2057 2058# Script to generate missing namespace dependencies 2059# --------------------------------------------------------------------------- 2060 2061PHONY += nsdeps 2062nsdeps: export KBUILD_NSDEPS=1 2063nsdeps: modules 2064 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2065 2066# Clang Tooling 2067# --------------------------------------------------------------------------- 2068 2069quiet_cmd_gen_compile_commands = GEN $@ 2070 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2071 2072$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2073 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2074 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2075 $(call if_changed,gen_compile_commands) 2076 2077targets += $(extmod_prefix)compile_commands.json 2078 2079PHONY += clang-tidy clang-analyzer 2080 2081ifdef CONFIG_CC_IS_CLANG 2082quiet_cmd_clang_tools = CHECK $< 2083 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2084 2085clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2086 $(call cmd,clang_tools) 2087else 2088clang-tidy clang-analyzer: 2089 @echo "$@ requires CC=clang" >&2 2090 @false 2091endif 2092 2093# Scripts to check various things for consistency 2094# --------------------------------------------------------------------------- 2095 2096PHONY += includecheck versioncheck coccicheck export_report 2097 2098includecheck: 2099 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2100 -name '*.[hcS]' -type f -print | sort \ 2101 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2102 2103versioncheck: 2104 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2105 -name '*.[hcS]' -type f -print | sort \ 2106 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2107 2108coccicheck: 2109 $(Q)$(BASH) $(srctree)/scripts/$@ 2110 2111export_report: 2112 $(PERL) $(srctree)/scripts/export_report.pl 2113 2114PHONY += checkstack kernelrelease kernelversion image_name 2115 2116# UML needs a little special treatment here. It wants to use the host 2117# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2118# else wants $(ARCH), including people doing cross-builds, which means 2119# that $(SUBARCH) doesn't work here. 2120ifeq ($(ARCH), um) 2121CHECKSTACK_ARCH := $(SUBARCH) 2122else 2123CHECKSTACK_ARCH := $(ARCH) 2124endif 2125checkstack: 2126 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2127 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2128 2129kernelrelease: 2130 @$(filechk_kernel.release) 2131 2132kernelversion: 2133 @echo $(KERNELVERSION) 2134 2135image_name: 2136 @echo $(KBUILD_IMAGE) 2137 2138quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2139 cmd_rmfiles = rm -rf $(rm-files) 2140 2141# read saved command lines for existing targets 2142existing-targets := $(wildcard $(sort $(targets))) 2143 2144-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2145 2146endif # config-build 2147endif # mixed-build 2148endif # need-sub-make 2149 2150PHONY += FORCE 2151FORCE: 2152 2153# Declare the contents of the PHONY variable as phony. We keep that 2154# information in a variable so we can use it in if_changed and friends. 2155.PHONY: $(PHONY) 2156